NoSQL Databases

A NoSQL database provides a mechanism for storage and retrieval of data which is modeled in means other than the tabular relations used in relational databases. Motivations for this approach include: simplicity of design, simpler "horizontal" scaling to clusters of machines and finer control over availability. The data structures used by NoSQL databases (e.g. key-value, wide column, graph, or document) are specified from those used by default in relational databases, making some operations faster in NoSQL. Sometimes the data structures used by NoSQL databases are also viewed as "more flexible" than relational database tables.

I am reading a book called express.js Blueprints. I am trying to wrap my mind around understanding authentication using passport. serializing and deserializing is not registering to me. I have just started learning node and express js so that's a big reason why.

Here's a code from the book on setting up passport. Starting with line 5, can someone please break down what's happening? Where is the "user" parameter coming from in the serializeUser function? Where did "user.id" come from?

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A technology that is kind of a fad,but will probably last but be not as popular are the no sql databases. They have there place for certain applications, but I don't believe they will replace SQL databases. Having to know how you are going to query before you store your data is just not realistic.

I am using php and mongoDb. I am new to mongoDb, but fine with php. In my mongoDb database I have a collection called 'users' with a number of fields such as firstname, lastname etc. There are a number of users.

The Percona Live Open Source Database Conference Europe 2017 is the premier event for the diverse and active European open source database community, as well as businesses that develop and use open source database software.

In this series, we will discuss common questions received as a database Solutions Engineer at Percona. In this role, we speak with a wide array of MySQL and MongoDB users responsible for both extremely large and complex environments to smaller single-server environments.

Recently I was talking with Tim Sharp, one of my colleagues from our Technical Account Manager team about MongoDB’s scalability. While doing some quick training with some of the Percona team, Tim brought something to my attention...

A simple login application using Node JS, Mongo DB and Express frameworks. There are tons of tutorials on Node JS and Express but most of the use extensive plugins which would confuse the beginners, the primary motive of this article is to ensure it captures the bare minimal functionality.

I’m looking for a good architecture to be able to efficiently query data currently stored in NoSQL dbs (specifically DocumentDB).

We have a number of microservices that manage various entities (say client, product etc). Each store their data locally (in DocumentDB). We want to create another microservice that provides the ability for real time (latency on the order of seconds) ad-hoc queries over this data.

One option is to replicate all this data and store it in an SQL db, and build the query service on top of it. I expect this would make the queries quite fast, especially if we index all columns. (Of course, since this data keeps changing, we’d listen to a message queue for db updates.)

Is this the best way? How do companies go about building ad-hoc query functionality of NoSQL data? This seems like a problem that many large companies would have to solve. (I am new to NoSQL and microservice architecture, so I might be missing something basic.) Any suggestion/alternatives are appreciated.

Is it just me or is NoSQL Overapplied? It seems like in an effort to be as trendy as possible people shoehorn obviously relational problems into non relational schema. If you have to start throwing foreign keys on your objects I think you need to rethink your solution. Sarah Mei makes a good point about this in her article:

It was definitely over applied initially. Though, I think it's gotten better over the years. Part of it, too, is that a lot of the relational databases started incorporating NoSQL-like features (i.e. PostgreSQL and their JSON capabilities).

I am a java developer and am very new to Linux and Cassandra. I am using Ubunto 16.04 and have installed cassandra v3.9.0 from datastax site. Now when i run the bin/cqlsh cmd from the cassandra directory i get error

No appropriate python interpreter found.

.

TO make sure I have python i tried this cmd python -v and then i get this message

I would like to know if the approach below can help us building an online application where One can upload Videos and comments from a registered user. we have choosen rdbms like mysql and no sql database like Mongo db database. In the rdbms we would be adding Master data such as registered table, country And region which would be static . The transactional data such as uploading the video, comments etc in the No sql database like mongo db, With this approach are we going to find a better managing the data or any other approach which yield in better result.. Infrastructure wise
we will be deploying in the AMAZON WEB SERVICE , idea is to have where agility, performance, and scalability reign supreme.

Assuming i have an parent class that I filter on various properties, one of which is a property that is an array of items . Now say that i want to only return the parent item if my array of items as above a min value and below a max value ...that's fine i can work that bit out; What if i then want to then sort on the filtered result set of those items

I made a c# fiddle example to show what im trying to achieve : https://dotnetfiddle.net/mV4d28 (note that foo2 is returned first even though foo1 has items in its array that are less that those in foo2)

As i need to do this using a index i need the index to be able to compute the order by based on the filter criteria used in my query.

I know elasticsearch has an inner hits function that dose this and mongo has pipelines which also dose this so im sure Raven must have a way of doing this too ?

I was hoping using just index and a transform with prams i could achieve this so I tried it:

NoSQL Databases

A NoSQL database provides a mechanism for storage and retrieval of data which is modeled in means other than the tabular relations used in relational databases. Motivations for this approach include: simplicity of design, simpler "horizontal" scaling to clusters of machines and finer control over availability. The data structures used by NoSQL databases (e.g. key-value, wide column, graph, or document) are specified from those used by default in relational databases, making some operations faster in NoSQL. Sometimes the data structures used by NoSQL databases are also viewed as "more flexible" than relational database tables.